Machine for concaving razors



(No Model.) 3 Sheets- Sheet 1.

H. FISCHER 8v A. RIGKENBAGHER. MAGHINB PoR GONGAVING RAZORS.

No. 537,411. PatenedApr. 9, 11395.

(Nov Model.) 3 Sheets- Sheet 2.

" H. FISCHER & A. RIGKENBAGHER.

MACHINE POB. GONGAVING RAZORS.

No. 537,411. Patented Apr. 9', 1895.

(No Model.) 3 sheets-sheen s.

H. FISCHER 8v A. RIGKBNBACHER. MACHINE FOR `COI\IGA'\I1\IG RAZORS. No.537.411. `PatentedAprl 9, 1895.

WMM

rran STATES.

MACHINE FOR CONCAVING RAZORS.

SPECIFICATION forming part of Letters Patent N o. 537,411, dated April9, 1895.

Application filed November 8, 1394:. Serial No. 528,233. (No model.)

To a/ZZ whom it may concerns Be it known that we, HUGO FISCHER and ADAMRIGKENBACHER, citizens of the United States, residing at Lynchburg, inthe county of Campbell and State of Virginia, have invented new anduseful Improvements in Machines for Ooncaving Razors, of which thefollowing is a specification.

Our invention relates to machines for concaving razors, our purposebeing to provide mechanism having a simple construction andorganization, of parts whereby a razor may be quickly and accuratelyground, by a barber, or by any person of ordinary experience andexpertness, without requiring skilled labor and expensive mechanism,which involve the necessity of sending the razor away and incurringvaconsiderable expenditure of time and money.

It is our purpose, also, to provide simple and novel means for lockingand holding the razor in position upon the grinding-wheel and forvibrating the same uniformly in order to form the concavity desired; thevibratory movement being capable of dimin ution, or enlargement to suitthe requirements of each case.

It is our further purpose to provide novel means for holding the razorupon the face of the grinding wheel in such manner that it may be groundto a true edge without danger of chipping the wheel, or mutilating theedge of the blade.

The invention consists, to the several ends specified, of the novelfeatures of construction and of the novel parts and combinations ofparts hereinafter fully described and then particularly pointed out inthe claims.

To enable others skilled inthe art to which said invention pertains tofully understand and to make, construct, and use the same, we will nowdescribe said invention in detail, reference being had, for suchpurpose,'io the accompanying drawings, in which- Figure 1 is a frontelevation of a machine in which our invention is incorporated. Fig. 2 isa side elevation of the same. Fig. 3 is a plan view of the plate uponwhich the vrazor is mounted for grinding. Fig. 4 is an edge elevation ofthe same, the point of view being upon the right hand of Fig. 3. Fig. 5is a plan view of the machine. Fig. 6 is a detail view of the boltandclamping devices by which the razor is held during the process ofgrinding. Fig. 7 is a side elevation of the grinding wheel. Fig. 8 is adiametrical section of the same.

The reference numeral 1, in said drawings, indicates the frame ofthemachine, which su pports a horizontal work-table 2 and a powershaft 3,arranged beneath the table, said shaft carrying a belt-pulley 4, whichmay, also, serve as a y-wheel. The shaft may be driven by any suitablepower, but may also be operated by any ordinary form of 4treadle 5,having a pitrnan connection with a crank 6.

Upon the table 2 are arranged twoupright brackets 7,substantiallysimilar to each other, and in these brackets is supported ahorizontal shart 8, having a small pulley 9, which is geared to thedriving pulley 4 by a belt 10. This pulley is usually mounted upon theleft hand end of the shaft, as shown in the drawings, and upon theother, or right hand end, is the grinding-wheel 12, the peculiarconstruction of which we will now explain. body of the Wheel is formedof rubber which is vulcanized in part, or not at all, so as to leave itselasticity unimpaired. Upon the periphery of this body of rubber iswound a strip of emery-cloth 13, several layers deep, the loose endsbeing fastened by glue, or cement. This strip may be wound upon anysuitable disk, or form, other than the rubber body of the wheel, uponwhich it is placed when required for use. The wheel is then placed uponthe shaft 8, between washers 14, which are pressed against the parallelfaces of the wheel in any suitable manner, as, for example, by nuts 15.This pressure expands the rubber against the winding of emery cloth,drawing the latter perfectly smooth and causing it to adhere with greattenacity tothe rubber. It is evident that by simply releasing the rubberfrom the strain imposed upon it, the winding of ernery cloth may bereadily removed and a new one substituted.

Upon the table 2, at a suitable point with relation to the shaft 8, is ashort shaft 16, substantially parallel with it and supported in anysuitable bearings 17. This shaft serves as a pivotal axis for avibratory arm 18, provided with a slot 19, to receive the end of theshaft 16, to which it is clamped by a thumbscrew 20. The point ofpivotal vibration may The lOO

be shifted within the limits of the length ofi the slot 19, therebygiving a greater or less length to said arm from the point of pivotalsupport to its upper end. Below said point the arm passes through a slot21 in the table, said slot lying at right angles to the two shafts Eland 16. The lower end of the arm, which lies in a vertical planeparallel with the plane of rotation ofthe driving-pulley 4, is providedwith a longitudinal slot 22, in which lies a pivotal coupling 23,capable of adjustment in said slot. This coupling is connected to a rod24, which receives a telescopin g extensionrod 25,fastened by aset-screw 2G at any point of adjustment. The lower end of said rod isconnected to a ring 27 within which lies an ordinary eccentric 2S,mounted on the powershaft.

Upon the upper end of the arm 18 is a seat 29 for a mandrel 30, whichlies in substantial parallelism with the shaft 8 and is rigidly tixed inthe seat 20. Upon this mandrel is mounted a fiat plate 3l, of wood orother suitable material and havinga circular, or cylindrical sleeve, oropening, 32, which receives the mandrel 30 upon which said plate may bemoved and turned. Upon the edge of this plate next the free end of themandrel is a seat 33 adapted to receive a hemispherical bearing 34,through which passes centrally a rod, or strong wire 35, having at itsend a keeper, or yoke 36, which lies in the bearing 34. The keeper, oryoke, surrounds a bolt 37, lying parallel with the edge of the plate,while the rod or wire 35 is at a right angle therewith and extendsacross the plate parallel with the mandrel, its end projecting through abearing, or side piece, and receiving a thu mb-screw 38, by which theyoke or keeper 36 may be drawn into the hemispherical bearing 34. Uponthe end of the bolt 37 is a bracket 39, having a central slot 40, oneach side of which are forks 41, adapted to receive the shank of therazor blade. A rod 42, lying in a longitudinal recess in the bolt,carries a hook 43 on its end which curves over the shank of the bladelying in the forks 41, against which said hook is drawn by a thumbscrew44, thereby clamping the razor securely in position with its blade lyingagainst the lower face of the plate 31, the edge of the blade lyingadjacent to the free edge of the plate. The arrangement of the parts issuch that when the plate 3l is allowed to assume its normal position bygravity, the dat face of the razor willbe upon the grinding face of thewheel l2. The machine being set in motion, the wheel will revolve and alimited reciprocating movement will be given at each revolution of thepower shaft 3 to the plate 31. The operator who sits, or stands, infront of the machine, guides the plate 31 upon the mandrel 30 by hishand, moving it in such manner as to bring every part of the blade intoproper contact with the grinding-wheel.

Upon the face of the table2 are guide-ribs 45, between which a waterreservoir 46 is inserted and moved until it lies beneath the Wheel 12.In this cup isa light spiral or other form of spring 47, by which asponge 48 is held with suitable pressure against the grindA ing wheelthereby keeping the grinding face moist, preventing the razor fromheating, and by its constant wiping action keeping the grinding-facealways perfectly clean.

By the reciprocation of the plate 3l, through the action of the arm 18,the concave in the blade of the razor is extended in width and given therequired curve, the degree of vibration of the arm being` easilyadjusted to the width of the blade and the work required by shifting thepoints of pivotal support for the arm and of pivotal connection of itsactuat- 4 ing rod. As the vibration of the arm is uniform in degree andin time, the work can readily be done in an accurate and satisfactorymanner without special skill or experience previously acquired.

The mechanism described is not intended for edging razors, but forconcaving them. Nevertheless, when the work approaches completion, theedge of the razor will have been ground down until it is extremely fineand it is at this point that one of the advantages of using the plate 31will be found. Unless the blade is placed flat upon asurface similar tothat of the plate 31, and immovably held by a suitable lock, the edge ofthe razor will catch in the grinding wheel and turn the razor overinstantly, the grinding-face being frequently chipped and the thin edgeof the blade mutilated thereby.

What we claim is- 1. In a machine for concaving razors, the combinationwith a shaft carrying the grinding wheel, of a vibratory arm mounted andadjustable on a pivotal axis parallel with said shaft, a rod adjustablyconnected to the lower end of said arm and to an eccentric on thedriving-shaft, a plate movable longitudinally and revolubly on a mandrelcarried by the u pper end of the arm and parallel with the shaft of thegrinding wheel, and means for locking the razor blade to the lower faceof said plate, substantially as described.

2. In a machine for concaving razors, the combination with agrinding-wheel and its shaft, of a vibratory support,aplate movable onsaid support in parallelism with the shaft, a sliding bolt lying in akeeper upon one side of the plate at a right angle with the shaft,a hookarranged between forked supports on the end of the bolt, and means forclamping the bolt and hook, substantially as described.

3. In a machine for concaving razors, the combination with, agrinding-wheel and its shaft, of a flat plate of wood, avibratorysupport for said plate upon which the latter is movable inparallelism with said shaft, and means for locking the blade of therazor against the lower face of the said plate, substantially asdescribed.

4. In a machine for concaving razors, the combination with agrinding-wheel and its IOO IIO

IZO

shaft of a vibratorya'rm adjustable on a pivotal axis parallel with saidshaft, a driving shaft, a rod extensible in length one end connected toan eccentric on the driving-shaft and the other to a coupling adjustablein a longitudinal slot in the lower end of the arm, a flat Wooden plateloosely mounted by one edge on a mandrel carried by the upper end of thearm and movable on said mandrel in parallelism With the shaft of thegrinding- Wheel, a keeper having a hemispherical seat on an edge of theplate at a right angle with its line of movement, a bolt passing throughsaid keeper, its end provided with forked supports for the shank of therazor-blade, ahook HUGO FISCHER. [L s] ADAM RIGKENBACHER. [n siWitnesses:

DAVID WALKER, JOHN M. OTEY.

